Abstract

Compositional trends of the dynamical change in refractive index induced by band-gap illumination and its recoveries by irradiation of lower photon energy are investigated in thin films of As x S 100− x . The magnitude of the changes is positive when x ⪆ 35, otherwise negative, and has a maximum of 0.03 at x = 43. The experimental results suggest that the dynamical changes originate from trapping of photo-excited carriers, and are essentially related to an optical “stopping effect”.

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